Book of Evil

Book of Evil Slot Review

A pale moon hangs behind the reels. Its light is cut by bare, clawed branches and the silhouette of a dark spire, and embers glow up from the ground on either side. Book of Evil looks the part completely. Underneath the gothic dressing sits a familiar book-style engine: a Book symbol that does double duty as wild and scatter, expanding symbols in both the base game and the bonus, and a free spins round that can also be bought outright. SpinOn has kept the formula recognisable and wrapped it in a graveyard mood that suits it well.

The maths makes no apology for its edge: 94% RTP, high volatility, and a 5,000x ceiling worth €250,000. It sits alongside the studio’s Hoggin’ Gold and Zappin’ Zeus as a colder, darker proposition that stays close to the classic book-of template. Whether that template still earns its place is the whole question.

Base Game & Features

Play runs across a 5×3 grid with ten paylines. Wins pay left to right only, starting from the leftmost reel, and only the highest combination on each line is paid. Stakes run from €0.20 to €50 per spin, with a default bet of €1. It’s a setup that has barely changed since the first book slots, and SpinOn hasn’t tried to change it.

The Book symbol is the heart of the game. According to the supplier’s rules, it serves as both the wild and the bonus scatter. It substitutes for any symbol to create wins, and it triggers the bonus when three to five land on the reels. Five Books also pay 400x the total bet.

The base game also carries a random expanding symbol mechanic. At the start of any base game spin, a random symbol can be chosen to expand. If the required number of that symbol lands, the symbols expand to fill their reels. Expanded symbols don’t need to sit next to one another to form a win. Book wilds that land can also turn into the chosen symbol and expand if doing so completes or improves a win.

Symbol wins are multiplied by the total bet, and the top of the table is steep:

• Dracula: 2, 3, 4 or 5 on a line pays 1x, 8x, 80x or 400x the total bet
• Female vampire: 2, 3, 4 or 5 pays 0.5x, 3x, 25x or 150x
• Dark-haired man: 2, 3, 4 or 5 pays 0.5x, 2x, 8x or 50x
• Man with lantern: 2, 3, 4 or 5 pays 0.5x, 2x, 8x or 50x
• A: 3, 4 or 5 pays 0.5x, 3x or 12x
• K: 3, 4 or 5 pays 0.5x, 3x or 12x
• Q: 3, 4 or 5 pays 0.5x, 2x or 8x
• J: 3, 4 or 5 pays 0.5x, 2x or 8x
• 10: 3, 4 or 5 pays 0.5x, 2x or 8x

All four character symbols pay from two of a kind, which softens the low end slightly. For every character except Dracula, those two-of-a-kind returns are half the total bet. The royals need three, and they pay modestly when they get there.

The gap between the top of that table and the bottom is large, and it shapes the rhythm of the game. The two human figures pay identically, as do the A and K and the three lower royals, so the effective table is shorter than the symbol count suggests. A full line of Dracula returns 400x the total bet, matching the five-Book scatter pay, and that is exactly the kind of result the expanding symbols exist to set up.

Book of Evil Free Spins & Bonus Features

Free Spins

The Free Spins Feature is triggered by landing 3, 4 or 5 Book symbols on the reels in the base game. Each trigger awards 10 free spins, along with the respective scatter pay for the Books that landed. Free spins are played at the bet of the triggering spin, and any wins from the round are added to the win from the spin that triggered it.

Before the free spins start, a special symbol is chosen to expand throughout the entire bonus round. Whenever the required number of that symbol lands during the bonus, the symbols expand to fill their reels. This is the classic book mechanic, and it’s where the game’s bigger results are meant to come from.

Books stay active during the round, both as wilds substituting for all symbols and as scatters. Landing three or more again retriggers the feature for an additional 10 free spins.

Hit frequency across the game is 55.45%, so the reels aren’t idle. High volatility, though, means the gap between frequent small line wins and a well-expanded bonus can stretch a long way. Total winnings are capped at 5,000x the total bet, and once the cap is reached, any further spins are forfeited.

Bonus Buy

For players who’d rather not wait for the Books to arrive, the round can be bought directly from the base game:

• Buy Free Spins: 100x the current bet (the button reads €100.00 at the default €1 stake)

Because the price is set as a multiple of your bet, it scales with your stake rather than staying fixed. According to the supplier sheet, buying instantly awards 3, 4 or 5 scatters and triggers the bonus, which consists of 10 free spins. Scatter pays are still awarded, and additional wins can land on the trigger itself.

Whether 100x is good value depends on how you feel about paying up front for a high volatility round on a 94% RTP game. The price is at least transparent, and the round you receive is the same 10-spin, expanding-symbol feature that the reels hand out naturally.

Verdict

This is a long, dark night of a game built squarely on the book template. The Book symbol works as both wild and scatter, three or more of them unlock 10 free spins with a chosen expanding symbol, and retriggers keep the round going. The random expansions in the base game add a little more life between bonuses than the oldest book slots offered. The weakness is plain: a 94% RTP means the waiting is priced in against you, and high volatility means the waiting can be long.

This suits players who like book slots in their traditional shape: an expanding symbol, a 5,000x ceiling to chase, and an atmosphere heavy enough to sit with while they wait. If a slow graveyard vigil with a familiar door at the end sounds like a good night out, this is your game. If it doesn’t, the castle gates open both ways.

Book of Evil FAQs

• What is the RTP of Book of Evil?

  Book of Evil runs at 94% RTP, which is on the low side for a modern release. The long-term return is modest as a result.
• Is Book of Evil high volatility?

  Yes, it’s a high volatility slot. Wins in the base game tend to be small, and the big money sits behind the free spins round.
• How do you trigger free spins in Book of Evil?

  Land 3, 4 or 5 Book symbols on the reels in the base game. Each trigger awards 10 free spins plus the respective scatter pay, and a special symbol is chosen to expand throughout the round. Three or more Books during the round retrigger it for another 10 free spins.
• Can you buy the bonus on Book of Evil?

  Yes. A Buy Free Spins button sits in the base game, and the bonus costs 100x your current bet, so the price scales with your stake. It instantly awards 3, 4 or 5 scatters and triggers 10 free spins.
• What is the maximum win on Book of Evil?

  The maximum win is €250,000, which works out at 5,000x the total bet.
• What is the minimum and maximum bet on Book of Evil?

  Betting starts at €0.20 and tops out at €50 a spin, which is a fairly narrow range for a high volatility title.
• What is the hit frequency of Book of Evil?

  The hit frequency is 55.45%, so just over half of spins produce a winning combination. Most of those wins are small line pays.
• How many paylines does Book of Evil have?

  There are ten paylines, and wins pay left to right only. Just the highest combination on each line counts towards a payout.
• Does the wild symbol do anything special in Book of Evil?

  The wild is the Book symbol, which is also the scatter. It substitutes for any symbol, triggers free spins when 3 to 5 land, and can turn into the chosen expanding symbol and expand if that completes or improves a win.
• Who makes Book of Evil?

  Book of Evil is made by SpinOn.